Safe Zone (PewdieCry) (Book 1)

(Book one of two! The sequel is also on my profile, entitled 'Out of the Woods'!)
The zombie apocalypse has happened. At first it was thought of as a worldwide sickness that could be cured, but scientists were quickly proved wrong as people began to turn into the undead. Pewdiepie, along with his friends CinnamontoastKen and Minx, have been on their own in the zombie apocalypse ever since the madness began. Cryaotic, with his friends Russ and Scott, keeps to the wilderness and avoids cities. All three share a dangerous past that could catch up to them at any moment. What will happen when these two groups meet?